organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain eukaryotes see Domain Eukaryota Chatton, 1925
     flagellated protists
       Order Prymnesiida Cavalier-Smith see Phylum Haptophyta D.J. Hibberd ex Edvardsen & Eikrem (2000)
         Suborder Prymnesiina Cavalier-Smith see Class Prymnesiophyceae D.J. Hibberd (1976)
           Genus Cruciplacolithus Hay & Mohler